Fig. 72: Vallisneria americana: a, pistillate plant, X V3; b, cross section of leaf, X 

 i; c, pistillate flower, X \\i>,; d, top of flower showing stigmas, X 4; e. spathe of stami- 

 nate flowers, X 1 '/•>; f and g, two views of staminate flower, X 28; h, capsule, X P/^; 

 i, young fruit, X % with fruit enlarged; j, seed, greatly enlarged. (Courtesy of R. K. 

 Godfrey). 



